package com.zheng.hospital.api;

import com.alibaba.fastjson.JSONObject;
import com.zheng.hospital.common.helper.JwtHelper;
import com.zheng.hospital.common.result.CommonResult;
import com.zheng.hospital.model.user.UserInfo;
import com.zheng.hospital.service.UserService;
import com.zheng.hospital.util.ConstantWxPropertiesUtils;
import com.zheng.hospital.util.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping("api/ucenter/wx")
public class WeixinApiController {
    @Autowired
    UserService userService;

    /**
     * 微信扫描后回调的方法
     * @param code
     * @param state
     * @return
     */
    @GetMapping("/callback")
    public String callback(String code,String state) {
        StringBuffer baseAccessTokenUrl = new StringBuffer()
                .append("https://api.weixin.qq.com/sns/oauth2/access_token")
                .append("?appid=%s")
                .append("&secret=%s")
                .append("&code=%s")
                .append("&grant_type=authorization_code");
        String accessTokenUrl = String.format(baseAccessTokenUrl.toString(),
                ConstantWxPropertiesUtils.WX_OPEN_APP_ID,
                ConstantWxPropertiesUtils.WX_OPEN_APP_SECRET);
        try {
            //从返回字符串获取 openid  和  access_token
            String accessTokenInfo = HttpClientUtil.get(accessTokenUrl);
            JSONObject tokenJson = JSONObject.parseObject(accessTokenInfo);
            String accessToken = tokenJson.getString("access_token");
            String openid = tokenJson.getString("openid");
            //判断数据库是否存在微信的扫描人信息
            //根据openid判断
            UserInfo userInfo = userService.selectWxInfoOpenId(openid);
            if (userInfo == null) {
                //第三步 拿着openid  和  access_token请求微信地址，得到扫描人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, accessToken, openid);
                String resultInfo = HttpClientUtil.get(userInfoUrl);
                JSONObject resultJson = JSONObject.parseObject(resultInfo);
                //解析用户信息
                //用户昵称
                String nickname = resultJson.getString("nickname");
                //用户头像
                String headimgurl = resultJson.getString("headimgurl");
                //获取扫描人信息添加数据库
                userInfo = new UserInfo();
                userInfo.setNickName(nickname);
                userInfo.setOpenid(openid);
                userInfo.setStatus(1);
                userService.save(userInfo);
            }
            //返回name和token字符串
            Map<String,String> map = new HashMap<>();
            String name = userInfo.getName();
            if(StringUtils.isEmpty(name)) {
                name = userInfo.getNickName();
            }
            if(StringUtils.isEmpty(name)) {
                name = userInfo.getPhone();
            }
            map.put("name", name);
            //判断userInfo是否有手机号，如果手机号为空，返回openid
            //如果手机号不为空，返回openid值是空字符串
            //前端判断：如果openid不为空，绑定手机号，如果openid为空，不需要绑定手机号
            if(StringUtils.isEmpty(userInfo.getPhone())) {
                map.put("openid", userInfo.getOpenid());
            } else {
                map.put("openid", "");
            }
            //使用jwt生成token字符串
            String token = JwtHelper.createToken(userInfo.getId(), name);
            map.put("token", token);
            //跳转到前端页面
            return "redirect:" + ConstantWxPropertiesUtils.YYGH_BASE_URL + "/weixin/callback?token="+map.get("token")+ "&openid="+map.get("openid")+"&name="+ URLEncoder.encode(map.get("name"),"utf-8");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     *  生成微信扫描二维码,返回生成二维码需要参数
     */
    @GetMapping("/getLoginParam")
    @ResponseBody
    public CommonResult getQrConnect() {
        try {
            Map<String, Object> map = new HashMap<>();
            map.put("appid", ConstantWxPropertiesUtils.WX_OPEN_APP_ID);
            map.put("scope","snsapi_login");
            String wxOpenRedirectUrl = ConstantWxPropertiesUtils.WX_OPEN_REDIRECT_URL;
            wxOpenRedirectUrl = URLEncoder.encode(wxOpenRedirectUrl, "utf-8");
            map.put("redirect_uri",wxOpenRedirectUrl);
            map.put("state",System.currentTimeMillis()+"");
            return CommonResult.ok(map);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return null;
        }
    }
}
